Skupina O.Petriny ( O.Petrina Band )
active from year 1980
studio band with ever changing line-up, backing C&K Vocal and also some other vocalists like Petra Janu or Petrina himself (though under different band names like Pro-Rock or Super-Robot)
Members:
Vladimir Kulhanek "Guma" (1987-1987) , bass guitar
Jiri Vesely, bass guitar
Pavel Skala "Pavel", drums
Martin Kratochvil, keyboards
Vladimir Padrunek, bass guitar
Lubos Andrst, guitars
Jan Hruby, violin
Ondrej Soukup, bass guitar
Jiri Hrubes, drums
Vladimir Cech "Vlado", drums
Jan Kubik, saxophones, flute
Jaromir Helesic, drums
Lubor Sonka, keyboards, arrangement
Jan Kolar, oboe, synthesizers
Petr Pokorny "Kulich", guitars
Petr Skoumal, piano, synthesizers
Otakar Petrina, guitars, leader
Petra Janu "vl.jm. Jana Petru", vocal
Discography:
SP / EP:
Kaleidoskop Ray Bradburyho / Prodavac vcerejsich snu ( Pospisil, Lubos ) , Supraphon 1978
Dziny barvy kuze / Veterani ( Leather Coloured Jeans/Veterans ) ( Pospisil, Lubos ) , Supraphon 1979 , 
Hudba z roku nahlas/Vzpominka na jednu venkovskou tancovacku ( Music From Year Aloud/Memoy Of A Provincial Dance Party ) ( Pospisil, Lubos ) , Supraphon 1979 , 
Ja nejsem zla / Tovarna na malery ( Janu, Petra ) , Supraphon 1980
Beatova Liduska / Detektiv ( Janu, Petra ) , Supraphon 1981
Kraska v nesnazich/Divoky jahody ( Beauty In Troubles / Wild Strawberries ) ( Pospisil, Lubos ) , Supraphon 1981 , 
Balada o zemi / Vylet ( C&K Vocal ) , Supraphon 1982 ,
Oblicej lasky / Znam cokoli ( C&K Vocal ) , Supraphon 1982 ,
Ponorna reka lasky / Holky (nikoliv z nasi skolky) ( C&K Vocal ) , Supraphon 1983 ,
Roboti / Vycitky ( C&K Vocal ) , Supraphon 1984 ,
participation:
Growing-up Time ( C&K Vocal ) , Supraphon/Artia 1981 ,
Ja & my ( Me & Us ) ( Janu, Petra ) , Supraphon 1982 ,
Tenhle vitr jsem mel rad ( This Wind I Liked ) ( Pospisil, Lubos ) , Supraphon 1983 ,
Balada o Zemi ( Ballad of the Earth ) ( C&K Vocal ) , Supraphon 1985 , 
Vsechno nebo nic ( All or Nothing ) ( Arnetova, Helena ) , Panton 1987 ,